Circular Polarizer Display with Quantum Dots for Fast Response
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face challenges in achieving high contrast ratio, wide viewing angle, and robustness against texture phenomena while eliminating the need for linear polarizers and enhancing response characteristics and transmittance.
Innovation Solution
The implementation of a display device with a first and second circular polarizer, a color conversion layer including quantum dots, and a liquid crystal layer with negative or positive dielectric anisotropy, which changes the phase of light by π/2 when an electric field is applied or not, and the use of organic materials in polarizers to minimize misalignment effects during substrate bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional LCD structure with linear polarizer is used, then device complexity is reduced, but response characteristics and transmittance are insufficient
Solution Approach 1:
The single linear polarizer is segmented into two circular polarizers positioned at different locations (one on the color conversion layer, another on the first substrate). This segmentation allows each circular polarizer to perform specific optical functions, improving response characteristics and transmittance while managing the increased complexity through functional division.
Solution Approach 2:
The patent changes the polarization parameter from linear to circular polarization. This parameter change fundamentally alters the optical interaction with the liquid crystal layer, enabling faster response characteristics and improved transmittance by matching the circular polarization state with the liquid crystal molecule orientation dynamics.
2Reliability
If linear polarizer is used, then manufacturing is simpler, but texture phenomenon occurs during power on/off cycles
Solution Approach 1:
Changing from linear to circular polarization parameter eliminates the texture phenomenon during power on/off cycles. The circular polarization state maintains uniform optical properties throughout the liquid crystal layer transition, preventing the localized texture patterns that occur with linear polarizers during switching states.
Solution Approach 2:
The patent employs a composite polarizer configuration combining two circular polarizers with specific orientation relationships. This composite structure provides robustness against texture phenomena while the organic material composition of at least one circular polarizer maintains ease of manufacturing through established organic polarizer fabrication techniques.
3Illumination intensity
If conventional polarizer configuration is used, then device structure is simpler, but transmittance is reduced
Solution Approach 1:
The polarizer function is segmented across two circular polarizers positioned at different locations in the display stack. This segmentation optimizes light transmission by ensuring that the circular polarization states align with the liquid crystal layer's optical axis, maximizing transmittance while distributing the complexity across multiple functional elements.
Solution Approach 2:
The transition from linear to circular polarization parameter fundamentally improves transmittance by matching the polarization state with the liquid crystal molecule orientation. This parameter change allows more light to pass through the liquid crystal layer during switching operations, enhancing overall illumination intensity and display brightness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration eliminates the necessity for linear polarizers, enhances response characteristics, improves transmittance, and reduces the impact of texture phenomena during power on/off cycles, resulting in faster response speed and improved display performance.
Implementation Method 1
when an electric field is generated between the first electrode and the second electrode, the liquid crystal layer may change a phase of light provided to the liquid crystal layer as much as π/2
Implementation Method 2
the first circular polarizer may pass, from among light provided to the first circular polarizer, light circularly polarized in a first direction about a transmission axis
Implementation Method 3
the second circular polarizer may pass, among light provided to the second circular polarizer, light circularly polarized in a second direction about a transmission axis
Implementation Method 4
a first wavelength conversion layer for receiving light having a first wavelength region and converting the light having a first wavelength region into light having a second wavelength region
Data Source
AI summary
A display device comprising: a first substrate, a second substrate facing the first substrate, a color conversion layer disposed on one surface of the second substrate and including quantum dots; a first circular polarizer disposed on the color conversion layer and a second circular polarizer disposed on either one surface of the first substrate facing one surface of the second substrate or the other surface opposed to the one surface of the first substrate.